Age limits and the internet

Sir, – Society, for good or ill, has decided that young people lack the maturity required to vote, marry, drive, sign legal contracts, have sex and join the army. There are age restrictions on all of these, and probably many other activities. Why then does nobody question the possession and use of smartphones? We are giving young people unfettered access to the internet and to all it contains. Is this wise? – Yours, etc,